S&S, cylinder head gasket. Diameter 3-7/8" MLS

Dyna Fat Bob 2008–2017 Dyna Low Rider 1999–2017 Dyna Street Bob 2007–2017 Dyna Super Glide 1999–2010 Dyna Super Glide Convertible 2000 Dyna Super Glide Custom 2005–2014 Dyna Super Glide Custom 110th Anniversary 2013 Dyna Super Glide Sport 1999–2005 Dyna Super Glide T-Sport 2001–2002 Dyna Wide Glide 1999–2017 Dyna Wide Glide 105th Anniversary 2008 Dyna Wide Glide Limited Edition 2001 Electra Glide 1999–2010 Electra Glide Classic 1999–2013 Electra Glide Standard 2003–2008 Electra Glide Ultra Classic 1999–2013 Electra Glide Ultra Limited 2010–2016 Electra Glide Ultra Limited 110th Anniversary 2013 Fat Boy 2000–2017 Heritage Softail 2006 Heritage Softail Classic 2000–2017 Heritage Softail Classic 110th Anniversary 2013 Heritage Softail Springer 2000–2002 Low 2005–2011 Low Rider 2010–2013 Road Glide 1999–2016 Road Glide Custom 2010–2013 Road Glide Screamin Eagle 2000 Road Glide Special 2015 Road King 1999–2016 Road King 110th Anniversary 2013 Road King Classic 1999–2016 Softail 2000–2007 Softail Custom 2007–2010 Softail Deluxe 2005–2017 Softail Deuce 2000–2002 Softail Night Train 2000–2009 Softail Springer 2000–2006 Softail Standard 2008–2015 Sport 1999–2003 Street 2015–2017 Street Glide 2006–2016 Street Glide Special 2014–2016 Super Glide 2007